Photographic recorder.



A E. BLONDEL.

PHOTOGRAPHIC RECORDER.

APPLICATION FILED AUG. 5| l9l3., RENEWED JULY 27,19i6;

1 ,1 96,837. lfatentedSepi'. 5, 191i).

\ //'ANDR E.E)LONDEL $51; A, atlo'maclgf 3 I "V/ UNITED STATES PA'lEQNT OFFICE.

ANDRE E. eLoimsL, or PARIS, rnaucn.

BHOTOGRAPHIC RECORDER.

Application filed August 5, 1913, Serial No. 783,208.

El 403mm it may concern e it lnown that I, ANDRE E. Brennan, a citizen of the Republic of France, residing Paris, France, have invented new and useful Photographic Recorders; and I do hereby declare the billowing to he a full, clear, and exact description of the same.

in l rench specification No.419118 are described 'varicus improvements for photomech circuit, only during the recording of the curves, shunts placed between the terminals of the galvanometers. Owing to the use of these shunts, it is possible to send perma nently into the galvanomcters only currentssulli ,ient-lv weak for not heating the galll suddenly cutting off these shunts, .t is po Male to double or treble or te increase in any desired proportion, in accordance with the foregoing; system of the current temporarily passing .igh. the galvz-inorneters. T his makes it thro possible therefore to increase to a consider able extent the deflections even with an optical system of small lengtl'r.

.Qhe same contact can be used for shortcircuiting a portion of the resistance WlllCh eers the are lamp lighting the galvanonr etcr. ml in that way for increasing also tor moment, during the time of recording the strength of illumination. On the'other hand, in order to enable zero lines for each curve to be traced, a cut-out relay controlled by electric contacts closed by the photographic recorder, citherat the beginning or at the end, or preferably at the beginning and at the end of each record of curves, is placed in series with each movable device of the Specification of Letters Patent.

a rap'tic recording of galvanometers with qu iclt 'lnlcnted Sept. 5, 1916.

Renewed July 27, 1916. Serial No. 111,750.

galvanomctors. These cut-out relays must give a very good contact when the oscillograph connected up for low pressure, and in such case it is preferable to use mercury cut-outs controlled by an electro-magnet.

These automatic devices described can be carried out in various ways and do not present any dilliculty for any engineer used to employing relays.

Figure 1 shows, by Way of example, a diegran'unatic view of one form of the invention; Figs. 2, 3 and 4. show diagrammatic views of portions of several modifications.

Having; i'ully described my invention, what 1 claim and desire to secure by Letters Patent is 1- 1. A. photographic recording process, consisting in controlling a mirror by an instrument the movements of which are to be recorded, sending a beam of light into said mirror, transmitting said beam onto a moving light sensitive surface, and increasing or rlccrcasiny the scnsi'tivencss oi the records during the displacement oil" the sensitive surface. i

in a photographic recorder. the combination with the source of electric light, of a mirror controlled by the instrument the r'novei'nents of which are to be recorded, a light sensitive surface adapted to receive a beam of light, relays acting on the circuit of the source of light and relays acting on the instrument, whereby the sensitiveness of the instrument may be increased or reduced.

3. in a g'ihotograpbic recorder, the combination of a source of electric light, of a mirror controlled by the instrument the movcn'icnts of which are to be recorded, a system of cylindrical lenses having the axes of their cylindrical surfaces vertical, a lightsensitive surface adapted to receive a beam of light deflected by the increments of said mirror, relays acting on the circuit of the source of light and relays acting on the in- Stl'llll'ltfllt. whereby the scnsitiveness of the instrument may be increased or reduced.

4-. in a photographic recorder, the combi nation of a source of electric light, of a mirror controlled by the instrument the. movements of "which are to be recorded, a system oi cylii'ulrical lenses basin; the axes of their eylirulrical surfaces vertical. a light sensitive surface adapted to receive a beam of light deflected by-the movements of said mirror, electric contacts opened and closed by said moving surface, and a cut-out relay ontrolled thereby and opening and closing the circuit of the instrument.

5. In a photographic recorder, the combination of a source of electric light, of a mirror controlled by the instrument the movements of Whichare to be recorded, a system of cylindrical lenses having the axes of their cylindrical surfaces vertical, a lightsensitive surface adapted to receive a beam of light deflected by the movements of said mirror, electric contacts opened and closed by said moving surface, a cut-out relay controlled thereby and opening and closing the circuit of the instrument, and cut-out relays acting on the circuit of the source of light.

6. In a photographic recorder, the combination of a mirror galvanometer; an arclamp; a movable plate holder for carrying a sensitive plate; a system of lenses for directing the light of the lamp upon the mirror and concentrating it on said plate; a battery having'one pole electrically connected to the her der; a cut-out relay; a pair of contacts adapted to contact the plate only at the limits of its movement; a con-- ductor connected to said contacts passing .around the magnet of the relay to the other pole of the battery; and a clrcuit adapted to connect in series the apparatus to be tested, and to be broken by said relay.

7. In a photographic recorder, the combination of a mirror galvanonieter; an arc lamp; a movable plate holder for carrying a sensitive plate; a system of lenses for directing the light of the lamp upon the min ror and concentrating it on said plate; battery having one pole electrically con nected to the holder; a cut-out relay; a pair a connect in series the apparatus to be tested,

and to be broken by said relay; a contact adapted to contact With the holder only dur mg the movement of the holder; a conductor connected to said last named contact and connected to the pole of the battery to which said flexible conductor not connected; relays in said conductor; a shunt around the galvanometer and adapted to be cut by one of said last named relays; and resistance in series with the arclainps adapted to be short circnited hy other of said last named relays.

In testimony-whereof, l have si ned my name to this specification in the presence of two subscrihing witnesses.

ANDRE BLUIIDEEL Witnesses ANciiLn Bonorrnnom, FRANK H; Mason. 

